A coalition of Native Americans battle to force the removal of dams owned by billionaire Warren Buffett that have devastated the salmon population on California's Klamath River. The hydro-power dams contributed to one of the worst fish die-offs in U.S. history and continue to turn the water into a toxic soup. 'If the fish are sick, we're sick,' says Merv George of the Hoopa Tribe. To rescue their river and save their culture, Merv and his combatants first travel to Scotland, then to the richest man in the United States. The dam owners praise hydro power as a low-cost, climate-friendly source of energy, a valuable resource they say they couldn't afford to lose. Yet, the tribes may soon trigger the largest dam removal project in history.